When the Justice League comes upon a supernatural force against which even their powers seem useless, Batman assembles a second League of mystic heroes - the likes of Swamp Thing, the Demon, and Constantine - to help defeat this magical, otherworldly threat.

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When the Justice League comes upon a supernatural force against which even their powers seem useless, Batman assembles a second League of mystic heroes - the likes of Swamp Thing, the Demon, and Constantine - to help defeat this magical, otherworldly threat.